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I know how to add the handheld border shaders through RetroArch like the GBA one which was included in RetroArch's initial download or shader update here:
I find it much more enjoyable playing like this. Though I want to be able to add ones that I have downloaded like this Atari Lynx one:
Problem is it does not have a .cfg file, it just came with the following:The .ini just has the following information in it:
I know the short answer to this would just be to create a .cfg file, but I have tried and not succeeded. Has anyone done this before and if so would someone be so kind as to walk through it together and then hopefully others may benefit from it too. I have searched but have not found any tutorials or discussion detailing exactly this.
Also, one more question. For systems that one may be using the same core like gambatte_libretro.cfg for the GB and GBC but wish to have different custom configure in order to have a different handheld border shader if you copy your gambatte_libretro.cfg in the RA config folder and name it to something like gambatte2_libretro.cfg will it show up in the RA UI options?
Thank you in advance.

What would be the best way of setting the vertical games to use a different shader in RetroArch when I load those?
I am currently using a MAME romset in Launchbox (Arcade Platform) set to launch RetroArch MAME 0.170 core.
The shader I like to use for horizontal games is crt-royale-kurozumi.cgp. This shader does not work for vertical but I found
one that does. I just don't really know the best way of going about configuring all the vertical games to use another shader.
If anyone knows, Thanks for the help!